CVE-2022-22822

Name: CVE-2022-22822
Creator: NVD / NIST
Published: 2022-01-10T14:12:56.047+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.83%

Last modified Jun 17, 2026

CVE-2022-22822 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.. EPSS estimates a 4.83% chance of exploitation in the next 30 days.

Description

addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

4.83%

90.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libexpat Project	Libexpat	< 2.4.3
Tenable	Nessus	< 8.15.3
Tenable	Nessus	>= 10.0.0, < 10.1.1
Siemens	Sinema Remote Connect Server	< 3.1
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

http://www.openwall.com/lists/oss-security/2022/01/17/3Mailing List, Release Notes, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch, Third Party Advisory
https://github.com/libexpat/libexpat/pull/539Patch, Third Party Advisory
https://security.gentoo.org/glsa/202209-24Third Party Advisory
https://www.debian.org/security/2022/dsa-5073Third Party Advisory
https://www.tenable.com/security/tns-2022-05Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/17/3Mailing List, Release Notes, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch, Third Party Advisory
https://github.com/libexpat/libexpat/pull/539Patch, Third Party Advisory
https://security.gentoo.org/glsa/202209-24Third Party Advisory
https://www.debian.org/security/2022/dsa-5073Third Party Advisory
https://www.tenable.com/security/tns-2022-05Third Party Advisory

Timeline

Published: Jan 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-22822?

addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.

How severe is CVE-2022-22822?

CVE-2022-22822 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.83% probability of exploitation in the next 30 days.

How do I fix CVE-2022-22822?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-22822?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST